Hi,

I have to solve the general equation for this differential

$\displaystyle \frac{d^2y}{dx^2} - 6\frac{dy}{dx} + 9y = 50\sin(x)$

I have the homogeneous equation as $\displaystyle (A + Bx)e^{3x}$

However now that I am trying to get the partial equation I am stuck, I am unsure as what to use for the $\displaystyle y_{PI} = k(something)$ I have tried using sin(x) but that gets difficult to untangle

Thanks

Beard